Brown vat dye.



' a; 1 L v r iiin ins-Lies HAUL THOMASGHEWSKI AND HEINRICH RAEDEB, OF VOHWINKEL, AND WALTER, IVIIEG AND HAUL FISCHER, F ELBERFELD, GERMANY, ASSIGNORS 'IO FARBENFABRXKEN VURM. 'FRIE DR. BAYER & (10., OF ELBERFELD, GERMANY, A CORPORATION OF GERMANY.

senses.

BROWN VAT DYE.

Specification of Letters Patent. Patented Sept. 27., llll llilo lilo Drawing. Original application filed February 12, 1910, Serial No. 543,493. Divided and this application filed. April 21, 19l0. Serial No. 556,655.

To an whom it may concern:

"Be it known that we, PAUL THOMAS- oHnwsKr and HEINRICH RAEDER, residing at Vohwinkel, and WALTER Mme and PAUL FISCHER,- residing at Elherfeld, Germany, citizens of the German Empire, have invented; new and useful Improvements in Brown Vat Dyes, of which the following is a specification.

@ur present invention relates to the manu :Eecture and production of a new vat dye of the anthracene series. The process for its preparation consists in condensing 1-a1nino 4L benzoylaminoanthraquinone with 1 ben= 'Z0yla1nino 5-chloroanthraquinone and treating the resulting compound with concentrated sulfuric acid.

. The new product is after being dried and pulverizeda brown-black powder soluble in cold concentrated sulfuric acid with a brown color. sulfite and caustic soda'lye a vat suitable for dyeing cotton fast brown shades.

lncarrying out the new process practically we can roceed as. follows, the parts being by weig t: A mixture of parts of l-monobenz0yl-4-aminoanthraquinone (obtained by reducing. l-benzoylamino-i-nitroanthraquinone), 10.6 parts of l-benzoylarnino-5-chloroanthraquinone, 0.1 part of Guilt) 5 parts of anhydrous sodium acetate and'lQO parts of nitrobenzene is heated to It yields on treatment with hydro-' boiling for about 3 hours. The resulting product is precipitated from the melt with toluene. off, washed with water and alcohol and dissolved in 10 parts of concentrated sulfuric acid. The solution thus obtained is heated After cooling the dye'is filtered 1' to from 60-80 C. and poured into water. I

The precipitate is filtered oil? and dried.

We claim The herein described new vat dyestufi' of the anthrncene series which can he obtained by first condensing 1'-amino-4t-benzoylaminoanthraquinone with l-benzoylamino-5chloroanthraquinone and then treating the re suiting product with concentrated sulfuric summon RAEDER. [lbs] WALTER MIEG. [n s] PAUL FISCHER. [n s.]

Witnesses O'r'ro KoNIo,

WALTER VONNEGUT. 

